spl: spl - Solaris Porting Layer spl: spl: The Solaris Porting Layer (SPL) is a Linux kernel module which spl: provides many of the Solaris kernel APIs. This shim layer makes spl: it possible to run Solaris kernel code in the Linux kernel with spl: relatively minimal modification. spl: This can be particularly useful when you want to track upstream spl: Solaris development closely and don’t want the overhead of spl: maintaining a large patch which converts Solaris primitives to Linux spl: primitives. spl: